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LS1 Gen 3 Pre Ignition

This topic contains 1 reply, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 1 month ago.

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  • #989464
    Cino Buccheri
    Cino Buccheri
    Participant

    Hi Gino From Australia I have an LS1 in my VY Commodore SS, since i have done the following modification to my engine with the following
    CAM upgrade
    PART NUMBER: CT2871 49938B/49919A-112 DESCRIPTION: HOLD/CHEV LS1 GEN III HYD ROLLER CAM
    VALVE SETTINGS: INTAKE 0.000 HOT 0.000 HOT
    LIFT: INTAKE @ CAM .344″ @ VALVE .585″ ROCKER RATIO = 1.7
    EXHAUST @ CAM .341″ @ VALVE .580″
    CAM TIMING OPENS CLOSES ADV DURATION
    AT .006″ INTAKE 25 ° BTDC 69 ° ABDC 274 °
    TAPPET LIFT EXHAUST 71 ° BBDC 24 ° ATDC 275 °
    DURATION @.050″ CENTRE LINE LIFT at T.D.C
    IN 222° IN 110° IN .054″ LOBE SEPERATION ANGLE = 112°
    EX 224° EX 114° EX
    1 3/4″ headers into 2″ exhaust
    241 stock aluminum heads saved 30 thou
    I have a pre ignition mainly during the summer months when the engine reaches operating temperature between 1500 & 2000 RPM under load.
    I have swapped out the thermostat to a lower temperature opening thermostat, I have swapped out spark plugs to Brisk spark plugs and i have had timing taken out which is annoying as it has also reduced rwk.
    Any and all suggestions would be greatly appreciated
    Regards
    Gino

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  • #989467
    Nightflyr *
    Richard Kirshy
    Participant

    Common causes:
    Glowing hot or melted spark plugs
    Glowing hot exhaust valve
    Burning carbon embers

    Generally the fix(s) for pre ignition :
    Run higher octane fuel.
    Run the engine on the rich side.
    Try playing with ignition timing.

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